When viewed using a magnetic resonance imaging (MRI) system, invasive materials inside the human
body, in many cases, severely distort the MR image of human tissues. The degree of the MR image distortion increases
in proportion not only to the difference in the susceptibility between the invasive material and the human tissue, but
also to the intensity of the magnetic field induced by the MRI system. In this study, by blending paramagnetic Ti
particles with diamagnetic graphite, we synthesized Ti100-xCx composites that can reduce the artifact in the MR image
under the high-strength magnetic field. Of the developed composites, Ti70C30 showed the magnetic susceptibility of
χ = 67.6 × 10-6, which corresponds to 30% of those of commercially available Ti alloys, the lowest reported in the
literature. The level of the MR image distortion in the vicinity of the Ti70C30 composite insert was nearly negligible
even under the high magnetic field of 4.7 T. In this paper, we reported on a methodology of designing new structural
materials for bio-applications, their synthesis, experimental confirmation and measurement of MR images.